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<br />. <br /> <br />Woodward.CIyde Consultants <br /> <br />le07 <br /> <br />. <br /> <br />is extended into the backfilled cutoff trench; and lc) great <br /> <br /> <br />care is exercised cturing construction. <br /> <br /> <br />In our opinion, the Bureau's seepage analyses and approach <br /> <br /> <br />to minimizing the risk of piping are rigorous and conservative. <br /> <br /> <br />We believe the Bureau's present assumption of steady-state <br /> <br /> <br />con~itions at maximum reservoir level is appropriate. In our <br /> <br /> <br />opinion, the slurry trench should be continued to Station 224 <br /> <br /> <br />or an upstream earth blanket provided as discussed in Section <br /> <br /> <br />VI. We recommend consideration of installing an underdrain <br /> <br /> <br />system downstream from the dam for redundance, assuming that <br />the cutoff is not fully effective. <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />- 28 - <br /> <br />. <br /> <br />., <br />